Diamond grinding and polishing device



March 18, 1958 LAU 2,826,877

DIAMOND GRINDING A ND PQLISHING DEVICE I Filed Dec. 6, 1956 ew I Fllllll\l\l\\l\|\ I\ I5 1 4 7 9 10 5 I Ill/7h N 74 I I INVENTOR. J ,9 w24 Jfarilau,

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United States Patent DIAMOND GRINDING AND POLISHING DEVICE KarlvLan,.Ham!)urg-Farmsen,.Germany, assignor to Ernst Winter & Sohn,Hamburg, Germany Application December 6, 1956, Serial No. 626,727

Claims priority, application Germany January 26, 1956 6 Claims. (Cl.51-168) This invention relates generally to diamond grinding andpolishing devices used for grinding and polishing purposes, and hasparticular applicability to grinding and treatment of hard surfaces.

It was known in the grinding art to use grinding and grinding deviceswith their driving means, so as to provide the elastic action of saidflexible means with respect-to h F.

grinding pressure exerted upon the grinding surfaces'of such devices.These intermediate spring members were exposed to substantial" fatigue,which contributed to'a rapid wearing of said spring means and thegrinding surfaces. "Ihe adjustment of the tension of such sprin'glmembers was also rather diflicult and inconvenient. g,

It is a general object of the present invention to provide an improvedgrinding'and polishing'devica'including a flexible intermediate member,which will eliminate the fatiguing of the elastic means and of thegrinding surfaces, and will also provide a simple and accurate means foradjustment of the flexible action of said'flexible means, and thus theelasticity of the grinding device with respect to the desired grindingpressure. 7

More specifically it is an object of the present invention to provide anintermediate flexible member between the grinding member and the hubmeans, which will form part of the grinding member.

A further object of this invention is to provide a tensioning member ofannular shape leaning upon the flexible member of large dimensions,being connected to the hub means, which will enable a simple andadvantageous adjustment of the flexible action of the flexible member,and thus the elasticity of the grinding member relative to thepredetermined grinding pressure exerted upon the grinding layersprovided on the outer surfaces of the grinding member.

A still further object of the present invention is to design a novel andadvantageous grinding and polishing device having the diamond grinding,or polishing layers disposed both upon the circumference of the annulargrinding device and also upon the face of such device.

The foregoing statements are merely illustrative of the various purposesand objectives of this invention. Other objects and advantages willreadily become apparent from a study of the following specification,when considered in conjunction with the accompanying drawing, in whichseveral modifications of the grinding and polishing device embodying theprinciples of this invention are shown,inwhich:

Fig. 1 shows somewhat diagrammatically a sectionalview of an improvedgrinding device embodying the invention, and comprising a bowl shapedannular grinding device having the grinding surface on an outer face ofthe same;

Fig. 2 shows the grinding device of Fig. 1 modified by the provision ofa ditferent tensioning disc-shaped member;

Fig. 3 shows a modification of the grinding device of Fig. 1, whereinthe hub meansand the tensioning member are reversed in theirrelativeposition;

Fig. 4 shows a cross-section view of a grinding device having the"rinding surface on the outer circumference ofthe same; I s

Fig. 5 shows a combined grinding device having two grindingsurfaces, one,on itsouter circumference and the other on an outerface of the grindingmember.

Referring to the drawing s, and more particularly to Fig. 1 thereof, thegrinding'device comprises a grinding disc 1 of .preferablybowl-sha'pedform, which has provided on its face a grinding layer 2. A flexiblemember 10 is supportedonsaidgrinding member 1 by means of an annularmember 3, fastened to the grinding member 1 by means ofscrews 4. Theinner side of said flexible member 10 iscoi'mected to a hub means 9,provided on the grinding shaft for connecting the grinding device to itsdriving means, not shown. The arrangement of parts is such thatanannular portionll of the flexible member 1t is free of support,,andjcantherefore' be utilized for givingfthe device'.. the desireddegree of elasticity relative "to the grinding pressi ref 'lhe,fleiiiblemember 10, which preferably is the 'fo rrn of 'ajmembrane, ordisc is sup.- matymeanspna tensioningring 5. U disposed on thelhub means9,

videdjvvlthg ularfribs orbosses 6 and 7, preferablyidispo'jsjed pnoppositesideslof the member 5 at different the hub means 9.

As can be-seen in the modification according to Fig. l the membrane, ,ordisc 10; is tensioned by the lower rib 7. Infproviding.tensioningmelnbers 5 of different size, provided' with annular'ribs ofdifferent diameter, the degree of. elasticityof the disc. 10 .can beadjusted in simple manner tofany desireddegree. This is obtained in thatdifferent sized members 5-will produce different free annular surfaces11 on the membrane 10, thus changing to any desired-degree 'theelasticity .of the membrane 10. Under the influence of the grindingpressure P on its grinding surface 2, the grinding member 1 will tend tobend downwjardlyalong its periphery. This action will tend to lift therib 8 and to depress the rib 7. These bending forces will be compensatedby the free annular area 11 of the flexible member 10, which will thuprovide the necessary flexibility for the grinding operation.

The degree of flexibility of the device can be easily adjusted by theappropriate dimensioning of the tensioning member 5, or by selecting thedesired diameter of the annular ribs 7., 8 in appropriate manner.

In the arrangement of the modified device, as shown in Fig. 2, theposition of the tensioning member 5 is reversed relative to the membrane10, in that in this case the rib 6 is in contact with the membrane 10leaving only a relatively small freeannular space 12 between the innersurface of the grinding member 1 and the covered inner portion of themembrane 10 beneath the annular rib 6. This modification according toFig. 2 will substantially increase the rigidity of the grinding device,as compared with the modification shown in Fig. 1, due to thesubstantially-smaller annular membrane surface 12 as, compared withtheannular surface 11 of Fig. 1, the latter providin'f'asnbstantiallysofter grinding action.

I The elasticity of the grinding device will increase corre- Fig. 3,'therelative position'of the tensio'nin'g ring 5 and of the hub means 9 isreversed. In this case, the elastic action of the-membrane 10 will besubstantially reduced, so that the grinding device will becomesubstantially id. In this case the membrane 10 is rigidly supported bythe rib 6 from beneath and under the action of the grinding pressure Pwill not be able to produce any resilient spring action.

In Fig. 4 there is shown a modification of the grinding device whereinthe grinding layer '14 is disposed on the outer circumference of thegrinding member'l3, and the grinding pressure P is exerted upon thegrinding device not in axial direction,.but rather in a directionperpendicularly to the axis of the device. For this purpose the hubmeans 17, and the grinding ring 13 are respectively provided on theirinner surfaces with recesses 24, 15 disposed opposite each other. Therecesses are provided with sloping surfaces 16 and 19, and balls 20 aredisposed within'said recesses 15, 24. The resulting bearing support willenable an angular displacement of the grinding member 13 relative to theinner hub 17. The membrane 10 is in this case disposed above thegrinding ring 13, to which it is fixedly secured, and the inner edge ofthe disc 10 is supported by a nut 21, screwed upon the hub 17. Theadjustment of the degree of elasticity of the grinding device inthis'modification'is also very simple, and is effected by the adjustmentof the pressure of the nut 21 upon the membrane 10. Under the grindingpressure P the'grinding ring 13 will bemoved towards the hub 17 reducingthe spacing gap R between the grinding ring 13 and the hub 17. Thispressure will produce a resilient [action of the membrane 10 to agreater or less extent according to the degree of pressure exerted bythe nu't2 1. f "The balls 20 will be displaced by .this grindingpressure,and'will be able to return to their central position only afterthe grinding pressure P is compensated by the spring action of themembrane 10.

The arrangement as shown in Fig. 5 provides the possibility, inaccordance with the present invention, of cornbining the forms of twogrinding devices shown in Figs. 1 to 4 into a novel grinding unit,provided with grinding surfaces both upon its face and also upon itscircumference. The bowl-shaped grinding member 1, with its grindingsurface 2, is also provided with a second grinding surface 14. The hub17 is fixedly secured to the driving means or shaft 23 by means of a nut22. The previously described recesses 15, 24 are, in this case, disposedupon the inner surface of the grinding member 1 and in the hub 17,opposite each other. The balls 20 are again disposed within theserecesses, thereby enabling an angular displacement of the grindingmember 1 relative to the hub 17. The flexible membrane 10 is disposedabove the grinding member 1, to which it is secured at its peripher andat its inner edge the membrane 10 is secured to the hub 17 by means ofthe adjustable nut 21. By loosening or tensioning the nut 21, the degreeof elasticity of membrane 10 is readily varied. Under the grindingpressure T upon the grinding layer 14, the spring action of the grindingdevice will be effected in the manner shown in Fig. 4 by the movementpossible in the gap space R between the outer circumference of the hub17 and the inner wall of the grinding member 1. The grinding pres sure Pupon the grinding layer 2 will efliect the spring action of the membrane10 in a manner similar to that shown in Fig. l.

From the foregoing description it will be apparent that the inventioncontemplates a simple and effective means for providing an elastic,adjustable grinding device, which can be easily adjusted to the desiredgrinding pressure, and also enables the design of a combined grindingunit available for grinding operations having two spaced grindinglayers.

Although there is shown and described particular grinding devices, it isto be understood that the same were merely for the purpose ofillustration, and that changes and modifications may readily be madetherein, by those skilled in the art, without departing from the spiritand scope of the invention.

I claim as my invention: 1. A grinding and polishing device including aringshaped grinding member having a grinding layer disposed upon one ofits outer surfaces, a driving means for said,

grinding device, a hub means connecting the grinding member with saiddriving means, a flexible member for attachment of the ring-shapedgrinding member to said hub means, and a tensioning member fortensioning said flexible member of said grinding device, said tensioningmember having annular ribs of difierent diameters on both sides of saidmember, one of said ribs being in contact with said flexible member forsupporting and tensioning said flexible member, whereby the degree ofelasticity of said flexible member is adjusted by the appropriateturning of said tensioning member and the respective annular ribs.

2. A grinding and polishing device including a ringslraped grindingmember having at least one grinding layer disposed on one of its outersurfaces, a driving means for said grinding device, a hub meansconnecting said grinding member with said driving means, a flexiblemember for attachment of the ring-shaped grinding member to said hubmeans, the hub means and the grinding member of the device havingcomplementary annular recesses disposed opposite one another withsloping sides, and balls disposed between said recesses for movablysupporting the grinding member relative to said hub means.

3. A grinding and polishing device including a ringshaped grindingmember having at least one grinding layer disposed on one of its outersurfaces, adriving means for said grinding device, a hub meansconnecting said grinding member with said driving means, a flexiblemember for attachment of the ring-shaped grinding member to said hubmeans, the hub means and the ring-shaped grinding member of the devicehaving complementary annular recesses disposed opposite one another withslop ing sides, whereby said recesses in the ring-shaped grinding memberare provided on the inner side of same, and

balls disposed between said recesses for movably sup porting thegrinding member relative to said hub means.

4. A grinding and polishing device including a ringshaped grindingmember having at least one grinding layer disposed on one of its outersurfaces, a driving means for said grinding device, a hub meansconnecting said grinding member with said driving means, a flexiblemember for attachment of the ring-shaped grinding mem ber to said hubmeans, the hub means and the grinding member of the device havingcomplementary annular recesses disposed opposite one another withsloping sides, and balls disposed between said recesses for movably supporting the grinding member relative to said hub means, and nut meansprovided on said hub means in operative contact with the flexible memberfor adjusting the tension of said flexible member.

5. The combination in a grinding device having a grinding member with aplurality of grinding layers disposed on different outer surfaces ofsaid grinding member, driving means for said grinding device, a hubmeans connecting the grinding member with said driving means, a flexiblemember disposed between said grinding member and said hub means forattachment of said ringshaped grinding member to said hub means, andsupporting means in said grinding member and said hub member enabling anangular movement of said grinding member relative to said hub meanscomprising annular recesses in the grindin g member and the hub meansdisposed opposite each other, balls between said recesses, whereby thegrinding pressure on one of said grinding surfaces will develope aresilient spring action of said flexible member, and the grindingpressure on the other of said grinding surfaces will develope aresilient spring action of said flexible member in combination with saidsupporting means disposed between said grinding member and said hubmeans.

6. The combination in a grinding device having a grinding member with aplurality of grinding layers disposed on different outer surfaces ofsaid grinding member, driving means for said grinding device, a hubmeans connecting the grinding member with said driving means, a flexiblemember disposed between said grinding member and said hub means forattachment of said grinding member to said hub means, and supportingmeans in said grinding member and said hub means enabling an angularmovement of said grinding member relative to said hub means comprisingannular recesses in the grinding member and the hub means disposedopposite each other, balls between said recesses, adjusting meansprovided on said hub means for the adjustment of the tension of saidflexible member, whereby the grinding pressure on one of said grindingsurfaces will develope a resilient spring 6 action of said flexiblemember, and the grinding pressure on the other of said grinding surfaceswill develope a resilient spring action of said flexible member incombination with said supporting means disposed between said grindingmember and said hub means.

References Cited in the file of this patent UNITED STATES PATENTS153,297 Elrod Sept. 14, 1915 2,106,033 Mall Jan. 18, 1938 2,295,282 MallSept. 8, 1942 2,371,021 Berry Mar. 6, 1945 2,767,527 Guilbert Oct. 23,1956 FOREIGN PATENTS 8,029 Great Britain Sept. 7, 1905

